Governor



A. C. HOOF pria 3Q, i935.

GOVERNOR Filed sept. 17', 1952 of, under the forces created by the cylinder dis-v Patented pr. 30, 1935 UNITED STATES PATENT OFFICE 8 Claims.

'I'his invention relates to improvements in governors more particularly for gas engines, where a throttle valve is inserted in the neck of the intake manifold; and the closing movements thereplacement at different loads for a 'desired speed are' balanced by a spring resistance.

Objects of the invention are to provide a simpl practical form of governor which will automatically control the speed within close limits at different loads as on level .stretches and going up grades; to provide a resistance which increases rapidly as the valve is nearing 'its closed position, in correspondence with the increase in the turning forces exerted on thevalve near the closed position; and to provide an arrangement which Acan readily be set for different speeds, the arrangementy being such that the said increase or building up in-resistance is automatically greater for the higher speed settings and higher resistance tensions, than for lower speeds, in accord- 'ance with the differences in the turning forces at the different speeds for the same valve positions.

Further objects are to provide a governor having a key controlled adjustment, and a closure which is locked by the same key to prevent tampering.

Other objects and advantages will become apparent in the following description, of an illustration embodiment of the invention, with reference to the accompanying drawing, in which:

Fig. l is a side elevation, partly in section, of the governor incorporated in a block I0 which is inserted between the bolting fianges of the engine intake manifold and the carburetor, as will be understood.

Fig. 2 is a plan section, taken substantially on the line 2-2 of Fig. 3, with parts shown in full.

Fig. 4 is alpartial section on the line 1--1 of Fig. 3.

Fig. 5 is a detail section taken on line 5 5 of Fig. 1.

On one side of the block I0 is formed a housing I I, having a chamber I2 which is covered by means of a removable plate I3. An intake duct section I4 extends vertically through the block, and in the block is journaled a horizontally disposed shaft I5 which extends through at one side of the duct and into the chamber I2. In the duct a plate valve I6 is rigidly secured to the shaft;`

and on the outer end of the shaft, within the housing, is pinned an arm I1having a roller I8 rotatablymounted on its outer end. In the wide open position of the valve, the arm I1 abuts against a stop lug Ia, formed on the adjacent wall of the housing.

In the base of the housing I I, below and at the side of the shaft opposite the arm I1, is formed a boss I9 in which is rotatably mounted a block 2l) which has a lugZI extending into the boss. The block 2n has a transverse slot 22 in which is clamped, by means of screw 24, a multiple graduated leaf spring 25 which extends below the shaft' substantially parallel with the arm in the open position of the valve, the longest leaf being in cooperable relation with roller I8;

-A screw 26 is rotatably mounted in a lug 21,

,formed on the lower'A wall of the housing, and

threaded on the screw is nut 28 which is engaged in a notch 29 formed in the lower end of the block 20. Thus the spring 25 may be swungtowards or .away from the arm I1 by rotating the screw 26 to effect tension adjustments. In the lower corner of the housing is provide a boss 3Il which has a bore 3I, -in-alignmentwith the screw 26, for receiving a lock cylinder 32, having transversely disposed locking tumblers 33. 0n the inner end of the' cylinder is an eccentric'ally disposed lug- 34 whiclilenters a cross slot 35. milled in the head 36,' of the screw 2G, so

that the rotative position of ythe screw is controlled by the lockcylinder.

The enlarged end 31 of the lock cylinder 32, abuts against a shoulder `38, formed' in the bore 3I, and oppositely disposed longitudinal slots 39 are formed in the walls .of the bore for locking engagement of the tumblers 33.

'I'he cover plate I3 is locked infpositionby the insertion of the cylinder 32. On the inner side of the upper edge of theA plate I3 are provided two curved lugs 4|) which hook into suitable slots 4I provided in the upper wall of the housing I I; and on the lower corner of the cover is a lug 42 which enters an enlarged recess 43 in the housing which is intercepted by the bore 3|.. The lug 42 is provided with an aperture 44 which registers with the cylinder bore 3l when the cover is in closed position, and receives the lock cylinder.

The cylinder is prevented from withdrawal by means of a radial lug 45 formed on the inner end thereof. The cylinder is inserted with the tumblers retracted and the lug 45 is passed through a notch146, formed in one side of the aperture 44, which registers 90 from the tumbler slots 39; and, as the cylinder is.rotated to locking position the lug 45 rotates in the recess 43 and engages behind the cover lug 42.

'I'he cover I3 is provided with a lug 41 for holding. the block 20' in position.

In operation, the ilow of the gases through the intake duct I4 tends to rotate the valve I6 towards closing position, until the valve reaches a position at which the torque on the shaft, and'opposing resistance of the spring are equal.

'I'he resistance of the spring is built up and the stiffness of the spring increases at an ever increasing rate as the flexure is increased, and this building up of resistance is further accentuated as the roller I8 rides up onthe spring and moves closer to the support block 20'. `Thus by proportioning the various parts, and regulating the effective lengths of the leaves, the resistance can be regulated to closely approximate the torque on the shaft at each position of the valve for the desired engine speed.

By changing the position of the block 2U, rotatively, by turning the screw 26, the governed speed ycan be changed as desired, and the resistance is increased more rapidly at higher tensions, in accordance with the greater increases in the torque at closed valve positions for higher speeds on account of the greater-degree of flexure of the spring, so that' good regulation can be obtained at different speeds.

Having thus described my invention, I claim:

l. A governor comprising a rotatably mounted shaft, a throttle valve and a crank arm fixedly secured to the shaft, a support and a leaf spring mounted on the support slidably contacted by the outer end of the crank arm, the spring being disposed so that the contact of the arm ap' proaches the support as the valveis moved toward closed position.

2. In combination with an unbalanced throttle valve, means for resisting'the closing movement of the valve comprising a leaf spring, a rotatably mounted block for holding one end of the springn the spring being clamped rigidly in the block and extending tangent tothe axis of rotation and a screw for securing and adjusting the block in rotative position to regulate the tension of the spring.

3. In combination with a throttle valve, means for resisting the closing movement. of the valve comprising a rotatably mounted block, a leaf spring rigidly mounted on the block andprojecting laterally therefrom for resisting the closing movement'of the valve, a rotatably mounted screw and avnut threaded on the screwand in engagement with the block so that the tension of the spring may be adjusted by rotating" the screw.

-4. A governor comprising a housing, a rotatable shaft mounted therein, a throttle valve xedly secured thereto at one end thereof, a crank arm secured thereto at the other end, a support pivotally mounted in said housing, a leaf spring assembly secured to said support and slidably contacted by the outer end of saidV crank arm,

the spring assembly being disposed so that the contact of the arm approaches the support as the valve is moved toward a closed position.

5. A governor comprising a housing, a rotatable shaft mounted therein, a throttle valve iixedly secured thereto at one end thereof, a crank arm secured thereto at the other end, a roller fastened to the end of said crank arm, a support pivotally mounted in said housing, a leaf spring assembly secured to said support and slidably contacted by said roller, the spring assembly being disposed so that the contact of the arm approaches the support as the valve is moved toward aclosed position.

6. A -governor comprising a member formed with a conduit portion and a housing portion, a rotatable shaft mounted in said member extending through said conduit adjacent one side thereof and into said housing portion, a flat valve plate secured thereto in said conduit, a crank arm secured to the end in said housing, aroller mounted on said arm, a support having a square opening therethrough pivotally mounted in said housing, and a plurality of leaf springs of different lengths secured in said square opening and extending therefrom, said roller adapted to contact the longest of said leaf springs and upon rotary movement of saidshaft' bring all of said springs under stress. I

7. A governor comprising a member formed with a conduit portion and a housing portion, a rotatable shaft mounted in said member extending through said conduit adjacent one side thereof and into said housing portion, a flat valve plate secured thereto in said conduit, a crank arm secured to the end in said housing, a roller mounted v on said arm, a support having a square opening therethrough pivotally mounted in said housing, and a plurality of leaf springs of different lengths secured in said square .opening and extending therefrom, said roller adapted to contact the longest of said leaf springs and upon rotary move- 'ment of said shaft bring all of said springs under stress, and means for adjusting said spring support to change the initial position of said leaf springs.

8. In combination with an unbalanced throttle valve, means for resisting the closing movement of the valve, comprising a leaf spring, said spring consisting of a plurality of leaves of graduated lengths, a rotatably mounted block for holding one end of the spring, the end of the leaf spring being rigidly clamped in the block so that the spring projects laterally from the block and tangent to the axis of rotation, and a screw for securing and adjusting the block back and forth in rotative position to regulate the tension of the spring.

ADDISON C. HOOF. 

